[QUOTE=RTFirefly]
How about telling us how it works in a criminal trial in your jurisdiction? Since the Fifth Amendment doesn’t go away when crossing state lines, or when entering the U.S. Capitol, we might learn how the Fifth Amendment might be kept from being used as an unlimited “get out of testifying free” card, without issuance of blanket immunity with respect to any crime the witness might have ever committed.
[/QUOTE]
In my jurisdiction, tie goes to the runner.
By that I mean that if a potential witness asserts a Fifth Amendment privilege, the prosecution’s only real tool is to offer a grant of use immunity. The immunity typically covers only the crimes under investigation. If the witness were to claim that this grant of immunity were insufficient, the prosecution can grant use immunity on a broader scale conditioned on the crime’s relationship of the sought testimony. That is, if the issue is bribes offered to building inspectors, the witness cannot request a broad grant of immunity, receive it, and have the following exchange:
Q: Did you ever see anyone in your office accept a bribe to approve an inspection?
A: No, but I wouldn’t have noticed anyway, being as how I was so preoccupied with the triple murder I committed. Good thing I have immunity now, eh?
That answer has no reasonable relation to the question being asked, and would exceed the bounds of a normal immunity agreement. It would be considered voluntary testimony. The immunity grant would typically cover only criminal liability that was reasonably elicited from the direct examination of the witness. If a question does not reasonably compel the disclosure of the information, or the answer is not reasonably related to what is being asked, the grant of immunity does not apply and the Fifth Amendment is not implicated. See generally Minnesota v. Murphy, 465 U.S. 420 (1984); see also United States v. Monia, 317 U.S. 424 (1943) “…a witness from testifying voluntarily…” to a matter is not protected by the Fifth Amendment.
So in my “child porn” hypo above, the government would offer immunity for whatever crimes might apply to firing US Attorneys. And Congress would keep its questions limited to that issue. If Congress crossed the line into territory not covered by the grant of immunity, and elicited testimony about additional crimes, the witness would still be immune from prosecution using that testimony. (Lefkowitz v. Turley, 414 U.S. 70, 77 (1973)).